Welded Threaded Pipe Fittings

Replacing the sealing gasket of the welded threaded pipe fittings is an important operation to ensure the sealing and normal operation of the pipeline system.The following is a detailed introduction to the replacement steps and precautions:

preparation

Preparation of tools and materials

Tools:Prepare suitable wrenches,such as adjustable wrenches,pipe clamps,etc.,for disassembling and installing threaded fittings;Sealing glue(as needed)can enhance the sealing effect;Cleaning tools such as sandpaper,brushes,clean cloths,etc.are used to clean the sealing surface.

Sealing gasket:Select the appropriate material and size of sealing gasket based on the specifications of the threaded pipe fittings,working medium(such as water,oil,gas,etc.),working pressure,temperature and other parameters.Common sealing gasket materials include rubber(such as nitrile rubber,fluororubber),polytetrafluoroethylene,asbestos rubber sheet,etc.

Safety protection measures

Close the valves of the pipeline system,cut off the supply of fluid,release the pressure inside the pipeline,ensure that the operation is carried out in a pressure free state,and prevent fluid from spraying out and causing injury.

Wear personal protective equipment such as gloves,goggles,etc.to avoid injuries such as scratches,punctures,or fluid splashes into the eyes during operation.

Remove the old sealing gasket

Dismantling pipe fittings:Use a suitable wrench or pipe wrench to loosen the connection part of the threaded pipe fittings in the correct direction.When operating,pay attention to even force and avoid damaging pipe fittings or threads with excessive force.

Remove the old gasket:After loosening the pipe connection,carefully remove the old sealing gasket.Pay attention to the damage of the old gasket,analyze the reasons for the damage,such as aging,deformation,corrosion by the medium,etc.,in order to take corresponding improvement measures when replacing the new gasket.

Cleaning the sealing surface:Gently sand the sealing surface with sandpaper to remove impurities such as dirt,rust,and residual old sealing materials,making the sealing surface flat and smooth.Then use a brush to remove the debris generated during polishing,and wipe it clean with a clean cloth to ensure that the sealing surface is dry and clean.

Install a new sealing gasket

Check the new gasket:Before installation,carefully check whether the size of the new sealing gasket matches the sealing surface of the pipe fitting,and whether there are any defects,damages,or other issues on the surface.If there are any problems,new sealing gaskets should be replaced in a timely manner.

Apply sealant(optional):If you need to enhance the sealing effect,you can evenly apply a thin layer of sealant on both sides of the sealing gasket.Pay attention to selecting sealant that is compatible with the sealing gasket material and working medium.

Place the sealing gasket:Place the new sealing gasket correctly on the sealing surface of the pipe fitting,ensuring that the center of the gasket is aligned with the center of the pipe fitting,and that the gasket completely covers the sealing surface.For some special shaped sealing gaskets,they should be placed according to their specific installation direction.

Reconnect the pipe fittings:Align the connection parts of the pipe fittings,preliminarily tighten the threads by hand,and then use a wrench or pipe wrench to further tighten according to the specified torque value.During the tightening process,attention should be paid to maintaining the coaxiality of the pipe fittings to avoid gasket displacement or uneven compression.

Inspection and Testing

Appearance inspection:After installation,check whether the connection parts of the pipe fittings are tight and whether the sealing gasket has excessive compression deformation or displacement.If there are any issues,adjustments should be made promptly.

Pressure test:Slowly open the valve of the pipeline system,gradually restore the fluid supply,and observe whether there is any leakage at the connection part of the pipe fittings.You can check for leaks by observing,touching,or using leak detection devices such as soap water,gas detectors,etc.If any leakage is found,the valve should be immediately closed,and the installation of the sealing gasket should be rechecked and adjusted until there is no leakage.